期刊
CEREBRAL CORTEX
卷 19, 期 10, 页码 2298-2307出版社
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhn248
关键词
mental rotation; sensorimotor theory; superior parietal lobule; supramarginalis gyrus; transcranial magnetic stimulation
资金
- Communaute Francxaise de Belgique-Actions de Recherche Concertees [07/12-007]
- Fonds Speciaux de Recherche of the Universite catholique de Louvain
- Fonds de la Recherche Scientifique Medicale
- Fondation Medicale Reine Elisabeth
- Fonds National de la Recherche Scientifique
Because motor imagery (MI) and visual imagery (VI) are influenced differently by factors such as biomechanical constraints or stimulus size, it is conceivable that they rely on separate processes, possibly involving distinct cortical networks, a view corroborated by neuroimaging and neuropsychological studies. In the posterior parietal cortex, it has been suggested that the superior parietal lobule (SPL) underlies VI, whereas MI relies on the supramarginalis gyrus (SMG). However, because several brain imaging studies have also shown an overlap of activations in SPL and SMG during VI or MI, the question arises as to which extent these 2 subregions really contribute to distinct imagery processes. To address this issue, we used repetitive transcranial magnetic stimulation to induce virtual lesions of either SMG or SPL in subjects performing a MI (hand drawing rotation) or a VI (letter rotation) task. Whatever hemisphere was stimulated, SMG lesions selectively altered MI, whereas SPL lesions only affected VI, demonstrating a double dissociation between MI and VI. Because these deficits were not influenced by the angular distance of the stimuli, we suggest that SMG and SPL are involved in the reenactment of the motor and visual representations, respectively, and not in mental rotation processes per se.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据